A prototype can be made from clay then copied to wax to make mold. But I would rather make something that can be CNC'd from a billet.
yes. that would be nice. but the factor is access to a CNC mill ($$) and the cost of the raw material.
sand casting material can probably be melted from large metal piece like screws/etc which are relatively cheap.
Interesting Idea! The you can cover it with pvc tubing or heat shrink tubing, to prevent paint damage.
unfortunately a trip to homedepot on the way home turned out empty handed.
